Roller conveyer



Oct. 29, 1929. L. LOWY ROLLER CONVEYER Filed May 4, 1928 All/ 74 I1",","lplllillllpull Patented Oct. 29, 1929 PATENT OFFICE LUDWIG L6W Y, OIDUSSELDORF, GERMANY ROLLER CONVEYER Application med Kay 4, 1928. SerialNo. 275,234.

My invention has reference to conveyers, more particularly such as usedin rolling mills. Such conveyers are now composed of a plurality ofmotor rollers each forming an independent unit, and lately motor rollershave come into use in which the motor is built inside the outer rollershell which acts as the support for the hot metal parts to be conveyed.The motor being completely enclosed 10 must be cooled so as to controlthe temperature of the motor windings and to protect the insulation.Ordinarily, for cooling the motor, air is blown through the windings, orthrough the windings and the shaft, which for that purpose is madehollow. This manner of cooling, however, requires a large volume of air,which moreover, must be filtered. Pipe lines of large diameter arerequire to carry the air from the fan to all the rollers of theconveyer,

and that means expensive installation.

By the present invention, I aim to overcome these defects which Iaccomplish by using water or other liquid cooling agent, of which acomparatively small amount with no extra pressure is suflicient toeffectively cool the rollers. This manner of cooling does not call forhigh power consumption and permits pipes of small diameter to be mountedalong the conveyer.

In the annexed drawing in which I have shown, by way of illustration afew embodiments of my invention, Fig. 1 is a central longitudinalsection through a motor roller; Fig. 2 is a section along line IIII inFig.

1; Figs. 3 and 4 are diagrammatic views showing a plurality of motorrollers; Fig. 5 is a similar view as Fig. 1 showing a modification, andFig. 6 is a section along line VIVI in Fig. 5.

40 At 1 in Fig. 1 is shown the stationary shaft of a motor roller. 2 arethe supports for the ends of the shaft. As shown, the shaft is providedwith a bore 3 extending almost all the way through the shaft. 8 is themotor stator mounted on the shaft, and 9 is the rotor element,preferably made of two relatively spaced concentric cylindrical shells.At 10 and 11 are shown bearings for said rotor element. The electriccurrent is supplied through a cable 12 which enters the shaft 1 at oneend thereof, as shown in Fig. 1, a bore being provided for that purposein the shaft at 12.

4 is a cap screwed onto the end of shaft 1 for supporting the inlet pipe5 provided for the admission of the liquid cooling medium. Said pipeextends almost all the way into the bore 3. Within the cap 4 is formedan overflow shown at 6 in Fig. 2.

In the construction just described, the liquid cooling medium enteringpipe 5 flows in the direction of the arrow pointing to the right inFig. 1. The pipe being open at its end, the cooling medium returnsthrough the bore 3 of the shaft and after having passed the overflow 6in cap 4 escapes through the outlet 7, shown in Fig. 2. There being acontinuous flow of the cooling medium, the heat developed in the motorwindings as well as the heat being transmitted from the outside by thehot "material passing over the roller is thus carried off by the coolingmedium.

Where several motor-rollers are combined in parallel to constitute aconveyer, as shown in Fig. 3, all the outlets 7 are connected to acommon discharge pipe extending along the conveyer, while the inlet endsof the various inlet-pipes 5 are all connected to a common supply-pipeshown at 14 in Fig. 3.

In the diagrammatic Fig. 4 the motor rollers are shown combined inseries. in which case the bore 3 extends through the entire shaft ofeach roller so that the cooling medium can fiowsuccessively through thevarious shafts, passing through the same in alternate directions. Theadvantage of this arrangement is that instead of two pipes as in Fig. 3only one pipe-line is required.

Fig. 5 shows a construction designed for a roller conveyer situated inhot surroundings, where heat will radiate also against the bearings ofthe roller element, which, therefore, must also be cooled. 15 is thehollow stationary shaft resting on supports 16 and carrying twostationary hollow gaskets 17 and 18, one at each end, which gaskets arelocated outside of the bearings 19 and 20 supporting the motor roller21. 22 is the motor stator, which as in Fig. 1 is mounted on thestationary shaft 15 inside the motor rotor being completely enclosedthereby. The hollow shaft 15 is closed at both ends.

The liquid cooling medium enterm through the inlet pipe at 29 intogasket 1 5 passes throu h the opening 23 in the wall of the hollow s aftinto said shaft flowlng therethrough in the direction of the arrowpointing to the right in Fig. 5. Through an opening 24: at the other endof shaft 15 the m cooling medium enters the gasket 18 and finallyescapes through the outlet pipe 30. As the two gaskets17 and 18 are thusalways filled with the cooling medium, the bearings 19 and 20 will thusbe efiectively cooled, while the 15 heat transmitted to shaft 15 iscarried off by the continuous flow of the cooling medium through saidshaft.

Accordingto the sectional view in Fig. 6 of gasket 17 a partition 26 isprovided therein 20 so that the cooling medium which enters the gasketthrough the openin shown at is compelled to flow into tlie hollow shaftthrough opening 23. A similar partition is provided 1n gasket 18 betweenthe opening 25 24 and outlet opening 27.

Since my invention is capable of other modifications than those shownand described, I do not, of course, limit myself to the constructionsshown'in the drawing. I claim:

In a motor roller for roller conveyers comprising a hollow stationaryshaft closed at 0th ends, an electric motor stator, an outer rotatableroller member, and rotor elements 5 respectively carried by saidstationary shaft and moved by said rotatable member, and bearings forsaid rotor element, the combination with said hollow stationary shaftand said bearings, of gaskets mounted on said station 40 ary shaftadjacent said bearings and in communication with said shaft so as toform therewith a continuous passage and to permit of admitting to anddischarging from said passage a liquid cooling medium. In testimonywhereof I aflix my signature LUDWIG LGVVY.

